Department of Environmental Science, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran.
Water Environ Res. 2019 Jun;91(6):475-482. doi: 10.1002/wer.1045. Epub 2019 Jan 30.
The present study describes the preparation and capability of the graphene oxide/almond shell (GO@AS) composite by a freeze-drying method. The composite showed excellent ability to uptake nickel and cadmium ions, which were characterized by Fourier transform infrared spectrum and scanning electron microscopy techniques. The optimized values of pH, contact time, and adsorbent doses were found to be 7.5, 30-180 min, and 0.1 g, respectively. Also, adsorption isotherms of metal ions on adsorbents were determined and correlated with common isotherm equations such as Langmuir and Freundlich models. The maximum sorption capacities of GO@AS calculated from Langmuir isotherm model were 121.95 mg/g for Cd (II) and 69.93 mg/g for Ni (II). A higher adsorption capacity was for Cd (II) on GO@AS. PRACTITIONER POINTS: Synthesis of graphene oxide-almond shell composite. Removal of Cd and Ni ions from water by graphene oxide-almond shell composite. Study of isotherm adsorption models.
本研究采用冷冻干燥法制备了氧化石墨烯/杏仁壳（GO@AS）复合材料，并对其性能进行了描述。该复合材料对镍离子和镉离子具有优异的吸附能力，通过傅里叶变换红外光谱和扫描电子显微镜技术对其进行了表征。通过实验确定了最佳的 pH 值、接触时间和吸附剂用量分别为 7.5、30-180 min 和 0.1 g。此外，还测定了金属离子在吸附剂上的吸附等温线，并与常见的等温线方程（如朗缪尔和弗伦德利希模型）进行了关联。通过朗缪尔等温线模型计算得到的 GO@AS 对 Cd(II)和 Ni(II)的最大吸附容量分别为 121.95 mg/g 和 69.93 mg/g。GO@AS 对 Cd(II)的吸附容量更高。
GO@AS 复合材料的合成。
GO@AS 复合材料从水中去除 Cd 和 Ni 离子。
吸附等温线模型的研究。
